索力测定常用公式精度分析

Precision Analysis of Conventional Formulas Calculating Cable Tension

本文分析了常用的频率法测定索力公式的精度。利用作者建立的拉索非线性有限元法分析程序,可得到对应特定索力的拉索频率分布,基于此频率分布,采用不同的索力公式可推算出对应的索力。通过对比所得索力与设定索力可判断各公式的精度。本文以某斜拉桥的拉索为例,对处于不同张紧程度、不同长度的拉索进行了分析。分析结果给出了频率法测定索力时的注意事项,以及各公式的适用范围,并推荐了一种高精度的索力推算公式。

The precision of Conventional formulas calculating cable tension was studied in this paper.Using the nonlinear finite element analysis program developed by the author,the frequency distribution of a cable with given tension can be valued.Based on the frequency distribution,the corresponding cable tensions can be calculated by the formulas.Comparing the calculated tensions with the given one,the precision of every formula can be decided.Taking the cables in one cable-stayed bridge as example,this paper studied the cables with different length and slackness.The results show the cases that more attention should be paid,the applicable scope of every formula,and one high precision formula is proposed by the author.